codeguard-0-xml-and-serialization Cursor ruleA
codeguard-0-xml-and-serialization from santosomar/ai-agents-for-cybersecurity is a Cursor rule: instructions the Cursor agent follows in that repo.
mdr add santosomar/ai-agents-for-cybersecurity/.cursor/rules/codeguard-0-xml-and-serialization.mdc@v1.5.0Pins v1.5.0 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 14 of 14 checks passed
- Kind
- Cursor rule
- Repository
- santosomar/ai-agents-for-cybersecurity
- Path
.cursor/rules/codeguard-0-xml-and-serialization.mdc- Versions recorded
- 2
- Latest version
- v1.5.0, committed Oct 12, 2026
- First version recorded
- Oct 19, 2025
- Size
- 4,089 bytes
- Repository stars
- 251
- License
- BSD-3-Clause
XML security and safe deserialization (DTD/XXE hardening, schema validation, no unsafe native deserialization).
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
rule_id: codeguard-0-xml-and-serialization
## XML & Serialization Hardening
Secure parsing and processing of XML and serialized data; prevent XXE, entity expansion, SSRF, DoS, and unsafe deserialization across platforms.
### XML Parser Hardening
- Disable DTDs and external entities by default; reject DOCTYPE declarations.
- Validate strictly against local, trusted XSDs; set explicit limits (size, depth, element counts).
- Sandbox or block resolver access; no network fetches during parsing; monitor for unexpected DNS activity.
#### Java
General principle:
```java
factory.setFeature("http://apache.org/xml/features/disallow-doctype-decl", true);
```
Disabling DTDs protects against XXE and Billion Laughs attacks. If DTDs cannot be disabled, disable external entities using parser-specific methods.
### Java
Java parsers have XXE enabled by default.
DocumentBuilderFactory/SAXParserFactory/DOM4J:
```java
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
String FEATURE = null;
try {
// PRIMARY defense - disallow DTDs completely
FEATURE = "http://apache.org/xml/features/disallow-doctype-decl";
dbf.setFeature(FEATURE, true);
…Read the whole file at its exact version.
How to install
mdr add santosomar/ai-agents-for-cybersecurity/.cursor/rules/codeguard-0-xml-and-serialization.mdc@sha256:3eb3a6f69cf7600aThe line at the top of this page pins the label v1.5.0, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_pfpdkvfrilxokpda)
2 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 2 versions of this file, between Oct 19, 2025 and Oct 12, 2026, about one every 358 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| v1.5.0 latest | 2026-10-12 | 227a2b6 | 4,089 B | A | view · diff |
| v1.0.0 | 2025-10-19 | 52abd04 | 4,091 B | A | view |
Audit of the latest version
- pass: Size between 200 bytes and 200 KB (4089 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
santosomar/ai-agents-for-cybersecurity · 251 stars · license BSD-3-Clause · pushed 2026-10-19 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_pfpdkvfrilxokpda GET https://markdownregistry.com/api/v1/resolve?ref=santosomar/ai-agents-for-cybersecurity/.cursor/rules/codeguard-0-xml-and-serialization.mdc GET https://markdownregistry.com/api/v1/blob/3eb3a6f69cf7600a21a2191a59fc4da828d4cc4858776f213623caa3061cacbf
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: Cursor rules vs AGENTS.md · which agent file does what.